Lathe



Sept. 2, 1930.

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" end to, provide an iinpr'ovefd; eutoinatie -Ifee'd;

table; showing t Patented Sept. 2, 1930 LATHE Application filed April 1latter to the slide feed mechanism continuously in gear With the feedshaft. h

QMy present invention is in the nature ofan iinprov'ement on the-latheofn iy former petentz foresaid, and has for its princi pal ohjeets toprovide an iniproved drive from the feed she'fttothe slide "feedmechanism, to provide an, improved quick return inecha- 01; the slide;to provide an improved au omatic spindle spe'edcon'trol mechanism,

direction control mechanism,

Other obj ects and advantages 'oi'the inven-x e tiiionjvill beepperentto persons skilled in the art 'Qsthe seine becomes betterunderstood by reference to the following jd'eteil description,

' e r p d g relat g ges the same; and

" 12 is an; enlarged, Verti through one of thejt'ool slides.*Referringto thedrawings,

having ofthe 'clutch shiftingjle'v UIS E GQD RIA X, or MADISON,wIso-oN'sI iI nsslelvon To GIS'HOLT MACHI E Q GOMPANY, or MADISON,W'ISCQNSIN,'IAGOBZPORATION or wIscon sriv" er that controlsthe" forwardandreverse slide feeds and the trip actuated cont-rolling and actuatingmechanisinf therefor, showing different positions ively to the cam"vvhich 'en-l I I V 11 are silde'end edge elevetifo'nsof, the camcliscishowjng the oppositely inclined peripheral cam groov s; and

cal section l v designetes as anlentiretyth'evhead' stock frame and housing, at the top of Which'is' .j oiirnaled the spin-V:

die 2 carrying at its forward end the chnck 3;. the. spindle' and chuckbeing shown as equipped 'With a compressed air device 4: for

operating the chii'clcjewsi 5 designates as an entirety the." bedequipped With suitable weyshonfwhich is slidebly mounted '21; table 6;

I a broad flet top surface on Whichn a-y be mofnntejd' 'in anvpositionorpositioiis' dee I siljedlorreqiiired by-the work onet'or more toolcerriers feach comprlslnge slide base 7 L I adapted to he detzi'cheblyfastened to the top throughholes v inside flalngesL'T of the base 1 ofthe table 6 as by .inechine screws 7 1 passed andscrewed into tappedholes in the tahletop (Fig; 2)", ;and a slide'prop er Smonnted ontheslide base a-nditself carrying the tool holdtaken in connection withtheaccompanying -er9, u 1 e I I drzt'wlngg wherein I' ha've illi-istreted aprec- :10; designates the power shait equlppedet j t'ioal Workingembodiment of ,theprinc'iple of theinventionyend'rin hich-11f; j 1 TFig. 1 is a 'front side elevation; partly in longitudinal sectio n ofthe lethej i fFig'. 2is a verticallongitudinal section; I '1 1 I'Fi 3 isIvertical transverseseotion l thm gh t e, heedstock; I

n horizontal section meg-a1; constant speed; ere'a. pair of clutched tothe s of clutches 12 an dienieterdrivin I I I meshing With' large andsmall d ameter" driven gears-17 and 18 0 ti'vely' slow or fast speedsclutch ,12 or 13 ,is engage "chan e rm, Qmn

of she "parts,

its on ter end'vvith the lien I Loose on shaftflO hill? adeptedto be.

clutches12 a a1 pulley 11 and runof the usual intermediate slider 14.lhe hubs f 19-, whereby the latter shaft is driven at r d. Intermediateshaft, 19 "drives; bajck; gear Y sh 2Q;is1pinion123 meshing with drivingarr 2 1s" u f fail infl'ztthesbf this general'type; I j 1' l {is-use c113 carry Smallend large," gearslh a nd'lfi respectively 11 intermediateshaft 7 ela- 3 ccordingly as the I an underlying cross-shaft 27.

through change gears 28, 29 and (F 1g. 1)

Describing now the feed for the tool slide orslides 8, this is obtainedfrom the spindle 2 through the following mechanism. Fast on the spindle2 is a spiral gear 25 meshing with and driving a spiral gear 26 fast onThis latter,

drives an underlying transverse shaft 31, fast on which latter is aspiral gear 32 (Fig. 2);, engaging and driving a spiral gear 33 on aclutch 34 mounted on a feedshaft 35,. On

shaft 35 is anotherclutch 36 through which reverse feed is eifectechthisclutch carrying a spiralgear-37' driven by a spiral gear 38 of Oppositepitch to-the spiral gear 32 that is slidableon a transverse shaft 39disposed parallel with the transverse shaft 31, and

- driven from the latter through change gears 30, 40 and 11 (Fig. Spiralgear 38 is 'slidable on shaft 39 in order to enable it to be taken outof mesh with gear 37 when a quick return of thetool slide is desired,

- as hereinafter explained. On shaft 35 betweenflthe loose clutch 34 and.36 is aslider 42 through the agency of which either clutch is clrivingly connected to the shaft. nected to one end of the shaft 35jbya' coupling' sleeveet3 is a feed shaft/44; on which Conis splined asleeve 45 having, a bearing in a bracket46 attached to the lower side ofthe forward endof the table 6. Fast on one end ofthe sleeve 45 isa drivesprocket 47 which,

tool sli'desrequired.

table, the drive chain 48; is engaged with an intermediate sprocket 54,the shaft, of which isfjo urnaled'in an intermediate pillow block"likewise adjustable in the T slot 53, and

carrying idlersprockets 56 and 57 oneither sideioffth'e'driven sprocket54.: Manifest1y additional sprocketsand pillow blocks can be providedtocorrespond with the number of Each sprocket shaft 51 is connected,preferably-by a universal joint coupling 58, to a shaft 59,"which latteris connected by. a sleeve coupling 60 to a short shaft' 61"f(lig. 12that is journaledin a. swiveled bearing .member 62, said bearing memberbeing pivotally mounted on the -lower, reduced end of a vertical shaft..63

jeurn led inthe slide base 7. (lo-operating bevel gears 64 and 65 on theshafts 61 and 63 respectively transmit the driveito'the shaft 63, onwhich latter is a worm 66 driving a I wori'n wheelGT mounted onahorizontal shaft 68 'inthe slide based On shaft 68 is a bevelrfge'arj(lg-driving a'bevel gear 70 fastoii a r0 'tary' spiral cam 7 1 suitablyjournaled .in the slide base; In the slide 8 is a stud" 72 carry-,

.mga roller 73 engaged with the spiral groove of-the "cam 71 toadvance'and retract the,

slide as thejcam is rotated. ,The construction readily permits thesubstitution of cams having different pitches to obtain the combinationof feeds desired for the tool carried on the slide, and the cam may alsobe arranged with increasing or decreasing pitch as the cut proceeds andwith a straight groove at the end to give a dwell or clean-up out justbefore the feed is reversed and the tool slide retracted.

The slide and feed cam construction herein shown and last abovedescribed is substantially identical. with that disclosed in my formerPatent No. 1,524,860, February 3, 1925, to which reference may be hadfor a more detailed description.

Sprockets 19, 50 and 5 1 of varying numbers of teeth may be employed tothereby obtain different-ratios of feed for and be tween the slides; andthe adjustability of the pillow blocks transversely of the table,

'the universal joints 58 in the transmission shafts for the slides, andthe swiveled connection between the shafts 61 and 63, all contribute toa high degree of flexibility in the setup, enabling the slides tobepositioned parallel with, crosswise of, or at any intermediate angle tothe longitudinal median line .of the table without the necessityof'changing the slide drive. By employing the coupling sleeve 60 todrivingly connect the shafts 59 and 61, it is unnecessary to make theshaft 59 of exact length, and considerable variation in the fore and aftadjustment of the slide is possible. The presence of the universal joint58 also makes it unnecessary to accurately line up the shafts 51 and61,as well as enabling the slides to be set at varying angles. Theshafts 51, 59 and 61 with their couplings 58 and 60 manifestlyconstitute a flexible transmission shaft I between the shde'feedmechanism and an edge of the table.

Where but a single slide is used, the-intermediate pillow b-lo'ck andits sprocket may be omitted, and either of the end sprockets 4:9, 50,used as an idler. v

As hereinbefore stated, clutch 34 on shaft 35. is employed for forwardfeed of the slide, and clutch 36, rotating in the opposite direction, isemployed for reverse feed of'the slide. Loose on shaft 35 is a sprockethub 74' (F igs. 2 and 7) carrying sprocket wheels 75 and T 6. Sprocketwheel 75 is driven at high speed by a chain 77 from a sprocket 78 on thepulley shaft 10 (Fig. 4); and when itIis'desiredtohave a quick return fthe cam slides,instead of reverse feed, the spiral gear 38-is slippedendwise out of mesh with spiral gear 37, and a spring-pressed pin 79(Fig. 7.) mounted in the hub of the clutch 36, (and normally locked inretracted position within the hub) is engaged with the rapid traversesprocket 75, so that when the slider '42 is shifted into engagement with-clutch36, a rapid traverse motion is trans- I ln-itted throughfthe 1eedshaft and the dew ."slides. i

, 'Describlngrnext fthe mechanism for traV scribed v transmission to thecamszin the tool ers'ing the table Gbackzand forth, journaled in andlengthwise of the lower portion. of the headstock and bed is a combinedtrip/and and safety ratchet 84%;t0 shaft .80." P On fthe opposite endofshaft 81aresecuredjasprocket Wheel: 85 and: 'spuin gear '86, the,'vsprocket Wheel 85 through a chain 87 andsprocket Wheel 88 drives aclutch 89=loose on'a countershaftQO in one" direction, and the spurgear- 86 through a spur gear 91 drives aiclutehl92 on the countershaft90 inthe reverse 'direc v tion: Betxv'eenfthe clutches 89- and 9219aslider 93 adaptedto drii ingly: Connect either.

clutch "to the -shaft 90. Keyed; onthe shaft 90 is-xa sprocket- Wheel"94 that is connected by a sprocket "chain to azspro cket'96 V (Fig;

fast with a safety clutch -97:on.a;1ea 1 screy 98 suitably'journaled on.the front of the machine. The leadscreWSSfis engaged" I Wit-hastationary nut.99v carried 'by aliracket 1 00 that is bolted to' tlieunder side of the table'6.- Clutch sliden 93 is operated from a ha'ndlever- ;throughla'linlt v I v across- (Figs. lOand; 11) ,twobftheseslots designated 129, located onehundred and 102,-an: arm .103 :tastfion -a transverse shaft .104 journaled'in the jside of -the :bed,andza forked clutch shifter carm'105 (E ig." 2) also fast on sliaft104:, vManife'stl'y; byfs-Winging the I hand "lever 1011116111161;(1116011011 roln a central or neutralfp0sition;.-rapidtraversemovement of the table 61 in the desired direc- I tion-isefiected.

7 Fast on the trip-"and tablet po werk l1iover' shaft 80 is acontinuously rotating dis cf 106 iii which are formed- Foams i throughwhich :boththe, reversing of the slide'feedhndthe: changing otthespindle sneede-areautoinati ca'lly or manuallyleffected.- Describing ithefinechanisni throughwhichlithe said cain disc effects the automaticreversal bftlle fe'ed, fastonQfeed shaft is} a-spiral-gear 107. meshingwith and 'drivin'g a' spiralfgear 108;]? fast on an underlyingtranserseshaft109 that'extends through bothsidei Walls ofit-he headstockhousing. 'Referringito-Fig 1-5 o n' the end of the-shaft: 109 ,Which"projects I through; theiront :wall is indexl' (ha-1 1110 I,adjustablymounted on" the periphery {ofwhich are tripdogs 111 and. 112these-dogs; being ofi'set laterallyf'of the periphery (of 'the dial discso. asto occupy difier'ent paths;- {By: setting one; of theadogs, to:the required posi t'i'on on the .disc th elengjth:ofg the T forwardfeed of the :tool block slidesis :determined',1-

and by setting-theother. dog to the required v position the; lengthoft-hel reverse-fees of the tool block: slides? isldeite'rlninedq Beneathand parallelWithfltheidial shaftr109 is a shatt'113 also'lprojectingthroughithe front and rear 'v 'wallS-Qf the heac'lstock'housing, andloose on the front @jorojeeting endg' of shaft-L 113 19. athree-armlever the two upper arms of which have mounted therein-plugs114 and 115 adapted;.tojbeltripped by the dogs 111 and L112respectively;The depending arm 116 of I this lever is connected; byra'link 117 to anupstanding arm 118 fast on a stub shaftll journaled in the lower portionofthe front side wall-of the'housing,asclearly shown in 7 Fig.1. -:Onthe nner 'end'of shaitl19 is a cylinderlQOtEigi 3) lllWlllCll is mounteda -spring-pressedplunger 121 formed wlth a Mishapedup' ier f end 9122.Journ aled in the headstoclz'housing directly; above and trans--Vers'e'to the axis of the camidise 106 is a shaft- 1-23 ("E-1g. 3,) onWhichis' jourha'led the elongated hub of a clutchshifter'arm125 that.straddles and actuates the-clutchvslider I 12 controlling the forward''andreverse'feed fclutches 34:)2L11tl 36 Journaled on the hub 112 1 isalever, the upstanding arm 126 of a which is adjustably coupled totheclutch arm 125 to actuate the'latter. YThe-dependinQarm 12? ofsaidlever carries 'onitslower end'and V projecting iromits inner edgetafeed trip dog 7 I other {of the continuouslyrotating cain disc f 128that normally:liesopposite one side orthe K106, iThe. periphery of said*discisforined V 7 i with four slots extend-ingxohliquely therekieightyllegrees apartt being inclined in one clirection" and thealternatingslots designated 1011118 0heing inclinedin thereversedirection. f @Vhenjthesmechanisin' 1s tr ppedieither by oftheOperatofthtough-a'tOotpedal 131'1ast formed with a wide centr'alV notch13321.net

on; either-side thereof with cam inclines. 134 The-pointedend122 oft-heplunger121 norlnallylies-againstoneiofthecain inelines 13 1 I )v and'holds thef'ee'd trip" dog128 froni'engag .-v I

ing-i 113111116 constantlyzrotating cam disc 106 s'o that itwill-notenter any of the-grooves; v I

ofthejlatter. But when, asstatedythe mechanisnristripped; thei pointejdhead of the Q1: plunger rides-into ,engage nentwith the ad-i a tacentside ofthe V notch ;133,"as' shown in: i

thuslpressing the teedatrip dbg V 105 on the stub shaft 119, the"feedtrip "dog 128 I isipressed"againstl the SlClG301113116 -Caln fdlSCsit 106 by the -1n'echanisn1 besti'shown htFigstS': and wherein it willbe is'een that the outerj side of the'leverarin'127 carries @at itsbeen, :end a shoe :132," the lower-ledge of which is "plunger acrossand" out of the notch 133 and i into engagement with the cam surface 134on mechanism is actuated in the reversedirection. Should the feed tripdog enter one of the groovesinclined in the wrong direction,

J it is at once e ected and falls into the next f groove by whichitispositively carried across to'the'opposite side. v The automatlc swindles oeed-chanmn mechanisinis very largelya duplicate of the automaticfeedqeverslng mechanism last above described. Briefly describing thesame,-

fast on the other end of "the shaft 109 which overhangs the rear sideof'the housing (Fig. 5) is'a dial disc 110', adjustable'onthe periphcryof which are'laterally offset trip dogs 111,

112', adapted to engage with plugs 113 and 114' mountedinflthe twoupperarms of a three-arm lever fast on the correspond ingend of the'sh'aft113, The depending arm I 116 of this'lever is connected/by a link117' to an'upstanding arm'118 fast on, a stub shaft 119' journaled inthe rear wall of't he housing.

vOntheinner end ofshaft ll9is a cylinder 120 carrying a spring-pressedplunger 121 ,formed with a pointed upper end or head 122. Said plungerco-operates with a shoe 132,;identical with the shoe 132, mounted on theouter edge of the depending arm 127 of a lever journaledon the shaft123. On'the in-,

ner edge of .lever' arm 127 is'carried the speedtripdog128' whichfunctions with the grooves of the camdi'sc in-precisely the same way as:the feed trip dog 128 previously deg scribed. "The upperarm l26 -of'the lever is adjustably-coupled to a lever 125,- carrying a forkstraddling and 'actuatingthe slider 14 that controls the speed-varyingclutches 1 2 and'13 This speed changing mechanism may] also befoot-operated when desired by means ofa pedal 135 (Fig; 1) fast on theshaft 113 on thefront side of the machine; YVhen the feed reversezoispindle speed is tripped by thefoot pedals it is, of course necessary ithat the foot pedalibeheld down untilthe trip has completed its cycle,in order to in:

s rethat the spring-pressed: plunger is jbroughtinto'engagement with thecam sur-';

face on the opposite side of the leverarm shoe,

thus preventing the, tripfldog being carried which position itremainsluntil theopposite. arm-of the lever is depressed by the reverse7 I travel of thejtrip d al andthe-other dog.

i alternatelyfrom side to sideb y the cam. disc. Duringan automatic tripthis feature is accomplished bythe dial dog holding-down its leveruntil-the trip cycle is completed, in

- Briefly describinga cycle ofoperation, and

, 'assumin'g that thetable 6 is in its rearmost position, the work isplaced in. the chuck 3, yand the slide bases '7 are'secured on the table7 ,6 at the positions and angles required for the iojob in hand. Thefeed trip dogs 111 and'112 Also the spindle speed trip dog's 111 and 112are set on the index dial 110' at positions which will change thespindle speed between fast and. slow at the required times. Through thehand lever 101, the forward rapid traverse of the table is thrown in andmaintained until the tool slides have been brought into operatepropinquity to the Work. The forward feed is then thrown in by one ofthe trip dogs 111, 112, and continues until the other dog, through thedescribed mechanism, shifts the clutch 42, thus arresting the forwardfeed and throwing in the reverse feed. When a change of speed isdesired, either during a forward or reverse feed, or between said feeds,this is automatically efiiected by one of the trip dogs 111, and 112acting through the described mechanism to shift clutch 14:, thusarresting the slow speed and throwing in the fast speed, or arrestingthe fast speed and throwing in the slow speed. If a quick return of thetool slide is re.- quired, instead of a reverse feed, this is obtainedby slipping the spiral gear '38 out of mesh with spiral gear 37 and, bymeans of pin 79, locking the hub of clutch 36 to rapid transversesprocket 75. At the conclusion of the job,'-rapid backward traverse ofthe table is effected through proper manipulation of the hand lever 101,a new piece of work is placed in the chuck, the trip dogs are reset ifthe new work requires different lengths offeed anddifferent spindlespeeds, and the describedcycle is repeated.

From'the foregoing it will be observed that my present machine employsspeed-reversing and speed-changing mechanisms both of which are actuatedby a single constantly running disc equipped with automaticallyselective and non-interfering cams for both operations,'and bothautomatic and manual trip mechanisms for said feed-reversing andspeed-changing mechanisms; and, furthermore, that the parts of thefeed-reversing and speed-changing mechanisms are to a large extentduplicates and hence-interchangeable, and the same is true of therepective strip mechanisms for operating them.

-Manifestly, this represents a considerable economy 1111116 cost andmaintenance of the machine and inthe ease and facility of readvantagesand utilities thereof. Hence. I

do not limit the invention to the particular embodiment disclosed forpurposes of illustration, but reserve all such variations andmodifications as fall Within the spirit and purview of theappendedclaims.

I claim: h 1. In a lathe, the combination with the spindle, chuck, andbed, of a flat table slidable on the bed toward and from the'chufck,

a plurality of slide bases and means for fasteningthe same onsaid table,tool slides on said bases, independent slide feed mechanisms in saidbases, a feed shaft driven from the spindle, flexible transmissionshafts drivingly connected at one end'to the respective slide feedmechanisms and extending thence over said table to an edge por tion ofthe latter, and compleniental transmission gearing continuously in gearwithsaid feed shaft and transmitting inovei'nent V r from the latter tothe other ends of said-flexible transmission shafts.

2. The combination defined in claim 1, wherein thecomplementaltransmission gear ing consists of a driving sprocket wheelsplined on said feed shaft, driven sprocket wheels on said flexible.transmission shafts,

transmissions, a clutch slider controlling both.

of said clutches,a lever for shifting said clutch slider, a speed tripdog carried by said lever, a continuously rotating disc formed with acam for actuating said speed trip dog, means normally holding said dogdisengaged from said cam, and adjustable trip mechanism forautomatically shifting said dog intothe path of said own at anypredetermined point in the operation of the lathe. I

5. The combination recited in claim 4, wherein the camis formed as apair of oppositely inclined oblique grooves across the periphery of thecontinuously rotating disc, and the speed dog lies opposite one side ofthe peripheral portion of said disc when one of said clutches is active,and opposite the other side when the other clutch is active.

6. In a lathe, the combination of a spindle,

a tool slide, mechanism for alctuatingsaid tool slide'from said spindle,said mechanism includlng a pair of oppositely rotating clutches and aclutch slider controlling the same for transmittingf forwardand reversevfeeds to said tool slide, .a' 'lever for shifting said clutch slider, afeed. trip dog" carried by said lever, a-continuouslyrotating discformed with ac'amfor'actuz tting said feed] trip dog, means normallyholdlng said Idog disengaged from said'cam,'and adjustable tripmechanism for automatically shifting said dog into the pathof 'said'canto trip. out one feed and trip in the other at any predeterminedpointinthe operation of the v lathe. ,7 r c -7. The combination recited inclaim 6, wherein the cam consists of two oppositely inclined obliquegrooves formed across the periphery of the disc, and the feed dog lies fopposite one side of the peripheral portion of the disc when one of thefeed direction con trolling clutches is. active and opposite the otherside when the other feed direction controlling clutch is active.

power transmissions from said pulley shaft to sald spindle and chucklnc'ludinga pair of 8V In a lathe, the combination of a pulley shaft, aspindle and chuck, differential speedclutches respectively controllingsaidtransmissions, a clutch slider controlling both ofsaid clutches, alever for shifting said clutch slider,a speed trip dog carried by saidlever, a-

cam for actuating said speed trip dog, means 7 normally holding said dogdisengaged from' said cam, trip mechani'sm'for automatically shiftingsaid dog into the path of said cam at i any predeterminedpoint in theoperation of the lathe, a tool slide, mechanism for actuate ing saidtool slide from said spindle, said ice mechanism including a pair ofoppositely rotating clutches and a clutch slider control ling the samefor transmitting forward and reverse feeds to said tool slide, a'leverfor shifting said last-named clutch slider, a feed I trip dog carried bysaid last named lever, a c I cam for actuating said last-named feedtripI dog, means normally holding said last-named dog disengaged from saidlast-named cam, and trip mechanism for automatically 'shift- I ,ing saidlast-named dog into the path of said last-named cam to trip out one feedand trip inthe other at any predetermined operation of the lathe; bothsaid speed changing and'feed of a single continuously rotating cam disclyin'gf between the levers carrying the speed 120 trip and the feed tripdogs.

reversing cams being formed in the periphery.

9; A lathe embodying the combination of l trip dogs are structurallyidentical andinter changeable and their. respective devicesv for holdingthem disengaged from their cams are likewise structurally identical andinterchangeable.

10. In a lathe embodying the combination ofclaim 6, and wherein themechanism for actuating the tool slide from the spindle inclaim 4, andwherein the speed trip and feed effect 1 eludes a feed shaft on whichthe forward and reverse clutches are mounted, and a separable drive gearfor the reverse feed clutch, means for effecting rapid rotation of saidfeed shaft through said reverse feed clutch whereby to quick returnmovements of the tool slide.

L. GODFRIAUX;

